I Have a RTR Original HPI Savage 21. I got this in a trade a month ago and did the OFNA throttle linkage Mod and put a HiTec 5645 for throttle servo.I don't know much about it since im not the original owner. The engine fires up and everything works as it should. The Tx is missing the bottom battery cover, (got it this way) it gets the job done but im shore you will be using your own electronics. Will also trade for an off-road nitro .21 engine.

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